The genotype frequencies of polymorphisms in the PTEN, AKT1 and p53 genes in patients with nasopharyngeal carcinoma and controls.

NOTE: The number of samples that were genotyped varies due to genotyping failure for some individuals.Abbreviations: OR, odds ratio; CI, confidence interval; NA, not applicable.aORs and P values were adjusted for age, sex, smoking and drinking status, smoking level and nationality.